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run code in 150+ php & hhvm versions
Bugs & Features
<?php function decorate(callable $fn, callable $decorator) { $wrapper = $decorator(); return function() use ($fn, $wrapper) { $gen = $wrapper(); // Only call the wrapped function if the decorator made "yield" if (!$gen instanceof \Generator) { return $gen; } // Use the yielded arguments, forward all if none given. if (is_array($gen->current())) { $arguments = $gen->current(); } else { $arguments = func_get_args(); } // Forward all throwed Exceptions try { // Send the decorated function's return value into the // decorator as return value of "yield" $gen->send(call_user_func_array($fn, $arguments)); } catch (\Exception $e) { $gen->throw($e); } }; } function foo($bar) { throw new Exception("Error $bar!"); } function catch_all_exceptions() { return function() { try { (yield); } catch (\Exception $e) { echo "catch_all_exceptions: Caught Exception: $e\n"; } }; } function once() { return function() { static $return; static $called = false; if ($called) { return $return; } else { $return = (yield); $called = true; } }; } function do_something_before() { return function() { echo "Before!\n"; yield; }; } $bar = decorate(function() { echo "Hello\n"; }, "once"); $bar(); $bar(); $foo = decorate(decorate("foo", "catch_all_exceptions"), "do_something_before"); var_dump($foo("bar"));
Output for 7.0.0 - 7.1.0
Hello Hello Before! catch_all_exceptions: Caught Exception: Exception: Error bar! in /in/jo1IG:35 Stack trace: #0 /in/jo1IG(26): foo('bar') #1 /in/jo1IG(26): {closure}('bar') #2 /in/jo1IG(76): {closure}('bar') #3 {main} NULL
Output for hhvm-3.12.0
Hello Hello Fatal error: Uncaught exception 'Exception' with message 'Generator is already finished' in /in/jo1IG:28 Stack trace: #0 /in/jo1IG(28): Generator->throw() #1 /in/jo1IG(73): Closure$decorate() #2 {main}
Process exited with code 255.
Output for hhvm-3.10.0
Fatal error: Generators cannot return values using "return" in /in/jo1IG on line 57
Process exited with code 255.
Output for 5.5.0 - 5.6.28
Fatal error: Generators cannot return values using "return" in /in/jo1IG on line 55
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Notice: Use of undefined constant yield - assumed 'yield' in /in/jo1IG on line 57 Before! Notice: Use of undefined constant yield - assumed 'yield' in /in/jo1IG on line 67 NULL
Output for 5.3.0 - 5.3.29
Catchable fatal error: Argument 1 passed to decorate() must be an instance of callable, instance of Closure given, called in /in/jo1IG on line 71 and defined in /in/jo1IG on line 3
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/jo1IG on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/jo1IG on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/jo1IG on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/jo1IG on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/jo1IG on line 3
Process exited with code 255.